Hi Giulia, thanks for reaching out. Yes, you can remove one-time option from your donation form. To do that, go to the campaign editor > Advanced tab. Under “Donation Intervals” section, uncheck “One-time” checkbox and enable other recurring intervals as per your need. Then click “Update & Preview”. Please feel free to reach out to us at support@donorbox.org if you have further questions.

Thanks for reporting the issue. From our testing we are unable to reproduce the issue. Will you please be able to share your browser version and a screenshot of the issue at support@donorbox.org? You can use https://www.whatismybrowser.com/ for sharing the browser details.